(19)
(11) EP 0 376 627 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.01.1991 Bulletin 1991/04

(43) Date of publication A2:
04.07.1990 Bulletin 1990/27

(21) Application number: 89313428.8

(22) Date of filing: 21.12.1989
(51) International Patent Classification (IPC)5: H02M 3/07
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 26.12.1988 JP 328257/88

(71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Kadoma-shi, Osaka-fu, 571 (JP)

(72) Inventors:
  • Misaki, Horozumi
    Suita-shi Osaka (JP)
  • Okada, Yasuyuki
    Takatsuki-shi Osaka (JP)

(74) Representative: Crawford, Andrew Birkby et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
       


    (54) Integrated high voltage generating system


    (57) The invention discloses an integrated high voltage generating system possessing a charge pump for boosting stepwise the potential of an output node sequentially from the value of a first supply voltage to the value of a second supply voltage in synchronism with the clock pulses applied through a capacitor, wherein the second supply voltage is supplied to the gate electrode of the output MOS transistor connected between the output node of the charge pump and the output terminal. In this constitu­tion, since the gate potential of the output MOS transistor is fixed at the value of the second supply voltage, the potential fluctuation due to clock pulses does not appear on the output voltage taken out of the output terminal.







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